Correct carb gasket - help please
Thread Starter
Pro
Joined: Nov 2008
Posts: 542
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From: Bloomfield Hills MI
Correct carb gasket - help please
I have looked through the AIM, service manual, etc. for my 1970 454 4-speed (no EEC) to find the correct carb gasket and come up with conflicting results. When I had the carb rebuilt, the shop gave me a thin stainless steel heat shield plus a thin gasket. Both have the four holes and 'smiley face'. I also have the original GM oversize heat shield too.
Now, the AIM shows the carb being mounted with an 'open style' gasket. Now I am confused. The car ran OK with the ones I got from the speed shop (installed thus: GM heat shield, carb gasket, stainless shield) but this seems incorrect. The GM shield is an open style, so the gaskets had nothing to compress on.
Can anyone point me in the right direction? Also the install order would be very helpful. I suspect it's simply GM heat shield, gasket (open type), then carb.
Any help is most welcome. Cheers, S.
Now, the AIM shows the carb being mounted with an 'open style' gasket. Now I am confused. The car ran OK with the ones I got from the speed shop (installed thus: GM heat shield, carb gasket, stainless shield) but this seems incorrect. The GM shield is an open style, so the gaskets had nothing to compress on.
Can anyone point me in the right direction? Also the install order would be very helpful. I suspect it's simply GM heat shield, gasket (open type), then carb.
Any help is most welcome. Cheers, S.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
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From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
What does the intake look like? 4 holes and the smiley? just 4 holes? Open large at the rear like a Q-jet? Holley?
There should be a gasket between the manifold and the heat shield.
There should be a gasket between the manifold and the heat shield.
Thread Starter
Pro
Joined: Nov 2008
Posts: 542
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From: Bloomfield Hills MI
Tim, it's the standard intake manifold for a Q-jet (duh - should have mentioned that in my OP), so that's just the four holes, secondaries being larger and the pattern 'splayed'.
Here's a pic of the intake:
Here's the carb before restoration:
Here's what it looked like before I removed it (note - the EEC is not connected and has now been removed. The carb was a replacement sometime in the car's life and is NOT an EEC either):
So, should there be 2 gaskets to 'sandwich' the heat shield? Looking at the photos I answered one of my own questions re: gasket to intake.
Thanks for helping.
Here's a pic of the intake:
Here's the carb before restoration:
Here's what it looked like before I removed it (note - the EEC is not connected and has now been removed. The carb was a replacement sometime in the car's life and is NOT an EEC either):
So, should there be 2 gaskets to 'sandwich' the heat shield? Looking at the photos I answered one of my own questions re: gasket to intake.
Thanks for helping.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
That makes it way better. That intake uses an open gasket that's about 1/4" thick and has a phenolic "button" at each stud. Check the length of the studs to be sure! You can put that on the intake, then your heat shield, then a thin paper gasket. Or the other way. I've got that shield under a Demon carb- just 2 thin gaskets with the aluminum sandwiched between.
Le Mans Master
Joined: Aug 2006
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From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Here's some part numbers.
Bottom gasket----------------Felpro 60043-----NAPA # (With foward grove)
Middle gasket (or use yours)---Felpro 60731-----NARA # (Stainless steel)
Top gasket (4 hole no grove ) Mr. Gasket 4256G
Middle gasket (or use yours)---Felpro 60731-----NARA # (Stainless steel)
Top gasket (4 hole no grove ) Mr. Gasket 4256G
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Thread Starter
Pro
Joined: Nov 2008
Posts: 542
Likes: 3
From: Bloomfield Hills MI
UPDATE: Two Fel-Pro gaskets and $3 later, I solved one of the main sources of vacuum leaks.
So, it's open style all the way.
Tim - if you do make it down here and I am around, I'll gladly buy you a few beers, mate!
Cheers
Simon.
So, it's open style all the way.
Tim - if you do make it down here and I am around, I'll gladly buy you a few beers, mate!
Cheers
Simon.